| 摘要 |
The invention relates to a pump (10) comprising a casing (12) in which a rotor (26) is arranged so as to be rotatable in the casing (12) about a rotational axis (28) that is fixed to the casing, the rotor (26) having at least one cut-out section (54) in which at least one displacement body (56) is accommodated and rotates about the rotational axis (28) when the rotor (26) rotates while running along an inner casing wall (44) of the casing (12), the displacement body (56) being radially movable in the cut-out section (54) between a position in which it is withdrawn into the cut-out section (54) and a position in which it is extended form said cut-out section (54). The inner casing wall (44), in the circumferential direction about the rotational axis (28), has a section in which the inner casing wall (44) is interspaced from the exterior (50) of the rotor (26) so that a first compartment (52) is defined in this section between the exterior (50) of the rotor (26) and the inner casing wall (44), the displacement body (56) subdividing the first compartment (52) into an advancing first sub-compartment (62) and a trailing second sub-compartment (64) when rotating about the rotational axis (28). The first sub-compartment (62) is connected to an additional compartment (68) by a first channel (68) and the second sub-compartment (64) by a second channel (70) in the rotor (26), said additional compartment being defined between the displacement body (56) and an inner wall (60) of the cut-out section (54). The radial movements of the displacement body (56) resulting from the rotation of the rotor (26) about the rotational axis (28) alternately enlarge the volume of the additional compartment, thereby producing an additional negative pressure in the additional compartment (68) and in the second sub-compartment (64), or reduce the volume, thereby producing an additional positive pressure in the additional compartment (66) and in the first sub-compartment (62). |
